ORA-01093错误解决

环境是RAC+RAC的DG的10.2.0.5环境

当时是把主备库打开，想启动MRP进程（实时应用），但是执行语句时出现1093错误：

SQL> alter database recover managed standby database ;
alter database recover managed standby database
*
ERROR at line 1:
ORA-01093: ALTER DATABASE CLOSE only permitted with no sessions connected




SQL> !oerr ora 1093
01093, 00000, "ALTER DATABASE CLOSE only permitted with no sessions connected"
// *Cause:  There is at least one more session other than the current one
//         logged into the instance.  ALTER DATABASE CLOSE is not permitted.
// *Action: Find the other sessions and log them out and resubmit the command

上面说的很清楚：原因是多于一个的会话连接当前数据库实例。ALTER DATABASE CLOSE is not permitted;

解决办法是退出该会话；

字面意思没有很懂，当我查看主备库状态时发现备库处于只读状态：

SQL> select open_mode from gv$database;


OPEN_MODE
----------
READ ONLY
READ ONLY

哎，粗心误大事啊，启动实时应用备库需要在mount状态下的；

解决办法是，把备库启动到mount状态下，再执行：

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup  mount;
ORACLE instance started.


Total System Global Area  327155712 bytes
Fixed Size                  1273516 bytes
Variable Size              96469332 bytes
Database Buffers          226492416 bytes
Redo Buffers                2920448 bytes
Database mounted.
SQL> alter database recover managed standby database disconnect from session;


Database altered.

 

ok，问题解决，其实就是要注意启用MRP，备库要处于MOUNT状态下进行

(注意：Oracle 10g，要在mount状态下，才能开启MRP。然而11g在open就可以)